Did you make this instructable?

If you are planning to eat it... I would guess that the fungus is most likely to be harmless, but gods only know.

As to what you can do about it: Now that the fungus has settled in, I can't think of a way to evict it that wouldn't leave the garlic inedible, short of tossing the whole thing and starting again with sterilized potting soil.

From what I know about fungi, they will either work symbiotically with plants, decompose dead plants or be parasitic on the plants. If the fungi are not killing your plant, then you should be fine to eat it. Fungi in the soil are normal.

That's a question that's sometimes hard even for experts to answer, unless the fungus is particularly distinctive. I've been told that "little white mushrooms" _aren't_ particularly likely to be edible, despite the fact that one of the most common eating varieties fits that description, and that beginning mushroom hunters are much better off looking for the more easily identified varieties.

If you aren't VERY certain you know what you've got, I would recommend assuming it isn't edible.

On the other hand, for most mushrooms, _tiny_ quantities aren't likely to hurt you. And I suspect it's just growing on the nutrients in the potting soil -- which, theoretically, might even help break them down and make them more available to the garlic plant. There's certainly lots of fungus outside, whether we see it or not, and we generally don't worry about it when we pick plants from the garden.

So ReDesign is probably right. I'd be a bit uncomfortable, but I am NOT an expert either on fungus or farming. (I'm somewhat surprised my attempt to grow tomatoes is succeeding... probably because I'm mostly staying out of the plant's way!)